I really have to call bullshit on that being big "b". There is no way in hell they've made such a quantum jump in NAND speeds, to the point they can move 3.2 terrabits per second. Even on a 128 bit bus that's a 25 ghz flipping clock! BULL FUCKING SHIT!
And even if the bus were capable of that, that's still exceeding the fastest server ssd memory chips currently on the market by a factor of 16.
256 bit bus at 4 ghz I could accept those numbers as megaBITS. There's a snowballs chance in HELL that's megabytes. There's not even enough room on the die using modern tech for the Max to have that many flipping "pins".
Unless of course being crApple their lying through their teeth... again... It's kind of their thing.
After all, we are talking about the sleazy shits who cozied up to schools to rewrite history and their place in it, marketed 18 bit auto-dithering displays as professional grade 16.7 million colour capable, neutered PCMCIA ports by removing two essential power lines to claim they magically invented a new standard "airport" connector, hardwired their proprietary DVD drives so that slave and master had to be grounded together to work, making third party replacements harder to add, spent years claiming failing displays were user's fault when they actually had a mismatch between connector and cable spec internally, and has always used propaganda if not outright bullshit to manipulate the feeble minded masses into spending 200% what the machines should really cost.
If ANY other company pulled half the shit Apple has the past 44 years, everyone from middle management upwards would be locked up for life.